There is a claim on Ancestry that Angus Gunn who was married to Janet Kerr was born in Halkirk, Caithness around 1790.
On SP in the Church of Scotland Parish registers there is an Angus Gunn baptised in Halkirk on 07/12/1790
parents : GEORGE GUNN/MARGT. GUNN
ReferenceFR301 (FR301) 037/ 10 276
Unfortunately nothing is ever that simple

as there is another Angus Gunn born in Halkirk in 1791
baptism : 25/09/1791
parents : WM. GUNN/MARGARET GUNN
reference : 037/ 10 128